Cognomen Ciais (Ciais 
) , worldwide, is a rare surname. The cognomen Ciais is characteristic of France, where it is a rare surname, New Zealand, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ciais | United Kingdom, Brazil, France, New Zealand, United States |
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philippe ciais researcher, FR (b. 1966) |
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| roger ciais French politician, FR (b. 1951) |
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| josselin ciais French actor, FR (b. 1995) |
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| laurenzo ciais French actor, FR (b. 1995) |
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Mr, Peggy, Roger, Denis, David, Dylan, Laura, Laure, Louis, Lydie, James, Eline, Marina, Marine, Marion, Marcel, Magali, Michel, Sophie, Sylvie, Albert, Angela, Kathy, Bruno, Cyril, Anaii, Ms, Ais, Kim, Liz, Mary, Stã, Cece, Paul, Rene, Gael, Arthur, Grã, Jean, Toni, Eric, Emma, Yves, Marie, Alice, Aline, Alain, Andre, Léo, and Ashley